THEME:   entries with 3 U's   
GOOD ONES:     Whom "I'm in love with" in an Ames Bros. song   YOU-YOU-YOU [love this one because it not only has 3 U's but also is pronounced so]      
BTW:   SCRUPULOUS and 3 U's, and 
unscrupulous has 4.  Wonder if there other words with as many.      
U.S. state with its own elec. power grid   TEX [the abbrev. for decades has been TX, so I'd clue it "John Ritter's dad" or "Kind of Mex?]      
Rude, annoying one, in slang   BOZO [not in my understanding of the slang; a bozo is a fool or dope with no hint of rudeness]      
Hot coffee server   URN [I couldn't help thinking it meant a waitress, but I guess that makes me a DOM (oddly not used since I became one)]      
RATING:    
 
 [for the theme more than the cluing and fill]
Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun